Content originally posted in LPCWare by research on Tue Aug 07 21:41:29 MST 2012
Hi,
I am newbie in lpc1788. anybody can help me to int PLL procedure for 64000 Clock in lpc1788 FBD144.
my code is
if ( LPC_SC->PLL0STAT & (1 << 25) )
{
// disconnect PLL0
//LPC_SC->PLL0CON &= ~0x02;
LPC_SC->PLL0CON =1; /* Enable PLL, disconnected */
// feed
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
}
else
{
// disconnect PLL0
LPC_SC->PLL0CON &= ~0x02;
// feed
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
}
// disable PLL0
LPC_SC->PLL0CON = 0x00;
// feed
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
// enable main oscillator, 1MHz - 20MHz
LPC_SC->SCS = 0x20;
// wait until ready
while (!(LPC_SC->SCS >> 6 & 0x1));
// select main oscillator (12MHz) as input for PLL0
LPC_SC->CLKSRCSEL = 0x01;
// configure PLL0
LPC_SC->PLL0CFG = (PLL_NSEL << 16) | PLL_MSEL;
// feed
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
// enable PLL0
LPC_SC->PLL0CON = 0x01;
// feed
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
Toggle_WD();
// set CPU clock divider - CCLK = 64MHz
LPC_SC->CCLKSEL = CCLK_DIV;
// wait for lock
while (!((LPC_SC->PLL0STAT >> 26) & 0x1)); // while ( ((LPC_SC->PLL0STAT & (1 << 26)) == 0) );/* Check lock bit status */
// connect PLL0
LPC_SC->PLL0CON = 0x03;
// feed
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
Time(50);
// wait for connected
while (!((LPC_SC->PLL0STAT >> 25) & 0x1));
while entering this routine, my hardware is restarted.
any body have idea..
